I think you mean ionic bond and not conic bond. The pair of elements that form an ionic bond are barium and chlorine.
 
        
             
        
        
        
Answer:
Its a 50% chance of it happeing 
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The most water on earth is held by the oceans . 
        
             
        
        
        
Answer:
The radioactive isotopes within these brains typically record the ages of the grains-not the time when the sedimentary rock was formed, making it difficult to date using radiometric dating. The half-life of U-235 is 704 million years.
Explanation:
hope this helps but if i'm wrong then i'm sorry..